That paragraph says some things that they can do. It in no way says they won't use your content for AI training and any number of other things.
Mozilla's point is that the whole document is sufficiently vague that they could use it to defend pretty much whatever use of your content that conceive of now or in the near future.
Mozilla's point is that the whole document is sufficiently vague that they could use it to defend pretty much whatever use of your content that conceive of now or in the near future.